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United States Patent | 5,603,194 |
Fridlyand ,   et al. | February 18, 1997 |
The present invention provides for an apparatus for retrofitting an existing wooden door having opposing surfaces to upgrade the fire rating of the existing door. The apparatus includes a door cover steel sheet having a non-combustible insulating coating on an interior surface for coveting at least one surface of the door and a lock set reinforcement bracket having a non-combustible insulating coating on an interior surface for surrounding the lock set opening on an opposing surface of the door, the apparatus providing at least a twenty minute fire rating to the retrofitted door. In an aspect of the invention, there is provided a method for increasing the fire rating of a door having opposing surfaces. The method comprises attaching to a first surface of the door, a door cover steel sheet having a non-combustible insulating coating on an interior surface to cover the entire surface of the door and attaching to a second surface of the door, a lock set bracket having a non-combustible insulating coating on an interior surface to surround at least a lock set opening in the second surface of the door, the modified door having at least a twenty minute fire rating.
Inventors: | Fridlyand; Semyon (Willowdale, CA); Perlin; George (North York, CA) |
Assignee: | Eveready Exact Closures Inc. (Concord, CA) |
Appl. No.: | 533063 |
Filed: | September 25, 1995 |
Dec 07, 1994[CA] | 2137499 |
Current U.S. Class: | 52/515; 49/460; 49/501; 52/741.3; 52/745.16; 52/746.1; 52/784.11; 70/417; 70/450; 109/49.5 |
Intern'l Class: | E04B 001/62; E06B 003/30 |
Field of Search: | 52/515,784.1,784.11,784.12,741.3,745.16,746.1 49/501,460 109/49.5,85 70/417,450,452 292/346 |
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